Particle-hole spectral asymmetry at the edge of multiorbital noncentrosymmetric superconductors

Abstract

Bogoliubov quasiparticles are a coherent electron-hole quantum superposition which typically, for time-reversal symmetric superconductors, exhibit a spectral distribution with particle-hole symmetry. Here, we demonstrate that in two-dimensional noncentrosymmetric superconductors with multiorbital spin-triplet pairing the energy profile of the density of states at the edge can violate this paradigm. We show that the structure of Andreev reflections generally leads to pairing states made of configurations that are orbitally split due to the low degree of crystalline symmetry at the edge. The resulting pairing state has a mixed parity character in the orbital sector that, in the presence of reduced crystal symmetry at the edge, sets out a particle-hole asymmetric profile for the spectral function. These findings indicate a path to design asymmetric spectral functions at the edge of superconductors with orbital degrees of freedom and time-reversal symmetry. The emerging signatures can be exploited for the detection of spin-triplet pairing equipped with internal degrees of freedom.

9 pages, 4 figures, and 10 pages, 7 figures in supplemental materials

References in corpus (27)

• Non-Abelian Anyons and Topological Quantum Computation
• Electric Field Control of the LaAlO${}_3$/SrTiO${}_3$ Interface Ground State
• From Andreev to Majorana bound states in hybrid superconductor-semiconductor nanowires
• Microscopic evidence for a chiral superconducting order parameter in the heavy fermion superconductor UTe2
• Unconventional Superconductivity in Heavy Fermion UTe2
• Theory of the proximity effect in junctions with unconventional superconductors
• Symmetries of Pairing Correlations in Superconductor-Ferromagnet Nanostructures
• Unconventional Superconductivity in UTe2
• Odd-frequency pairing in normal metal/superconductor junctions
• Surface density of states and topological edge states in non-centrosymmetric superconductors
• Topologically protected flat zero-energy surface bands in non-centrosymmetric superconductors
• Low energy band structure and symmetries of UTe2 from angle resolved photoemission spectroscopy
• Role of dissipation in realistic Majorana nanowires
• Designing spin and orbital sources of Berry curvature at oxide interfaces
• Colossal orbital-Edelstein effect in non-centrosymmetric superconductors
• Nature of Orbital and Spin Rashba Coupling in the Surface Bands of SrTiO3 and KTaO3
• Spectroscopic Signatures of Gate-Controlled Superconducting Phases
• Magnetic-Field-Induced Topological Reorganization of a P-wave Superconductor
• Particle-hole asymmetric superconducting coherence peaks in overdoped cuprates
• Orbital design of Berry curvature: pinch points and giant dipoles induced by crystal fields
• Gate-tunable hallmarks of unconventional superconductivity in non-centrosymmetric nanowires
• Orbital tunable 0-$\pi$ transitions in Josephson junctions with noncentrosymmetric topological superconductors
• Anomalous Josephson Coupling and High-Harmonics in Non-Centrosymmetric Superconductors with $S$-wave Spin-Triplet Pairing
• On the Origin of the Tunneling Asymmetry in the Cuprate Superconductors: a variational perspective
• From an insulating to a superfluid pair-bond liquid
• Electron-boson-interaction induced particle-hole symmetry breaking of conductance into subgap states in superconductors
• Surface State of Inter-orbital Pairing State in Sr${}_2$RuO${}_4$ Superconductor